21507201601 has 8 divisors (see below), whose sum is σ = 22804411680. Its totient is φ = 20226516768.

The previous prime is 21507201593. The next prime is 21507201641. The reversal of 21507201601 is 10610270512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21507201601 - 2³ = 21507201593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21507201641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4128631 + ... + 4133836.

It is an arithmetic number, because the mean of its divisors is an integer number (2850551460).

Almost surely, 2^21507201601 is an apocalyptic number.

It is an amenable number.

21507201601 is a deficient number, since it is larger than the sum of its proper divisors (1297210079).

21507201601 is a wasteful number, since it uses less digits than its factorization.

21507201601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8262623.

The product of its (nonzero) digits is 840, while the sum is 25.

The spelling of 21507201601 in words is "twenty-one billion, five hundred seven million, two hundred one thousand, six hundred one".